5261 libm should stop using synonyms.h

*** 25,35 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak pow = __pow
  
  /*
   * pow(x,y) return x**y
   *                    n
   * Method:  Let x =  2   * (1+f)
--- 25,35 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __pow = pow
  
  /*
   * pow(x,y) return x**y
   *                    n
   * Method:  Let x =  2   * (1+f)